Article ID: 312826 - Last Review: May 17, 2007 - Revision: 1.3

Some Laptops May Not Suspend Properly, Backlight Stays On

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This article was previously published under Q312826

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SYMPTOMS

When you either close the lid of your laptop computer or press the closure-detection button for the lid, the back-lit LCD display may not turn off on Windows XP-based computers.

If you manually enter suspend mode by pressing FN-F4, the backlight for the LCD display turns off. This problem does not occur if the laptop is connected to a CRT monitor.

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CAUSE

This problem occurs because there is an issue with the code in the Videoprt.sys video miniport driver.

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RESOLUTION

To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 (http://support.microsoft.com/kb/322389/EN-US/ ) How to Obtain the Latest Windows XP Service Pack

The English-language version of this fix should have the following file attributes or later:

   Date         Time   Version       Size   File name     
   -----------------------------------------------------
   03-DEC-2001  15:57  5.1.2600.21  65,024  Videoprt.sys

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows XP Service Pack 1.

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